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Now, Recursion(1) does its first print of the value one, then calls Recursion(0) which in its turn prints 0 twice like before, then execution returns to Recursion(1), which prints 1 again, after the execution of Recursion(0). That is why you see 1 0 0 1. The same applies to Recursion(2), which will wrap the result of Recursion(1) around twos.
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